Pressure filter is the way to go. Otherwise you'll damage everything in the system in case of pump failure (metal chips). You will kill expensive proportional valves etc. Pressure drop is a good thing - you can use this to detect clogged filter, there are switches build into filter housings (this is info for maintenance staff, to replace the filter).
The pump's suction line typically includes a suction strainer. However, restricting the pump's inlet can lead to cavitation, which can cause pump damage.
Okay, so I consider myself a mechanical genius and the way you presented this material made it quite accessible and I'm not afraid to say I understood everything and even come up with an alternative way to make a more effective spool valve design. But I didn't quite get the flow control valve you showed at 7:04 . I can see "the ball" will stop the flow going back, but what is controlling the flow in the other direction? Is it a fixed resistance to the flow or will it be shut when the flow goes through via "ball path"?
Okay, let's say the cylinder is extending. The oil flows through the check valve, pushing the ball open. But on the rod end, the oil has to pass through a metered orifice, which slows it down. This means the amount of oil entering the blind end is exactly the same as what's coming out of the rod end-no more, no less. I hope this answered your question.
@@Thequestionis-u3l Thank you for the explanation. Let me chew on it for a while? I understand what you are saying - but not why it is needed :( What is wrong with letting the oil pass unhindred back to the reservoir is more or less what I'm wondering about ..
Very simplified lesson but has a few issues. The counterbalance valve shown is not one usually used by industry. The pressure bleed down line from an accumulator to the reservoir should have a restriction in the outlet to avoid excessive flow rates. You mentioned that oil coolers have cooling tubes...yes but not always. The plate type heat exchanger has parallel plates. I think that there is one shown in the pictures. Full flow high pressure filters are a must for certain applications such as closed loop hydraulics where generated metal particles can circulate around in the loop and destroy everything...speaking from experience. Also I use high pressure filters in open loop circuits where the application has expensive components in it. The cost of the filter is minimal compared with the consequences. Also high pressure filters and normal return line filters have bypass valves to protect the filter if it becomes blocked. Also pressure switches are used to indicate a blocked filter. I realise this is an introduction but reservoir baffles to remove air? don't splash return oil to reservoirs? and moisture remove via desiccant filter breathers, shape of reservoirs? The other point to mention is that all circuits should be drawn in the deactivated state. Also circuits must consider vandalism especially on mobile equipmant. Some people think it great fun to put a handful of sand into the hydraulic reservoir. Cheers
Thank you so much for this. I just started a class on fluid power that has a lab. I like your analogy of reading a Hydraulic Schematic being like reading a treasure map, because that is exactly how I felt when I had my first lab. This video is helping me though, thank you so much!
Thank you for wanting to share my video! I’d really appreciate it if you could share the TH-cam link to ensure the original content stays connected to my channel. This helps me grow and continue creating more content. Let me know if you need any help with the link!
That is called a strainer or suction filter and has a 120-micron rating, meaning it only filters out larger particles. It's typically a standard component of the unit, which is why I didn't specifically mention it. Thanks for watching and your comment.
Pressure filter is the way to go. Otherwise you'll damage everything in the system in case of pump failure (metal chips). You will kill expensive proportional valves etc.
Pressure drop is a good thing - you can use this to detect clogged filter, there are switches build into filter housings (this is info for maintenance staff, to replace the filter).
I agree for servo and proportional valves.
Thanks!
Why not installing oil filter between the pump and the reservoir?
The pump's suction line typically includes a suction strainer. However, restricting the pump's inlet can lead to cavitation, which can cause pump damage.
Okay, so I consider myself a mechanical genius and the way you presented this material made it quite accessible and I'm not afraid to say I understood everything and even come up with an alternative way to make a more effective spool valve design. But I didn't quite get the flow control valve you showed at 7:04 . I can see "the ball" will stop the flow going back, but what is controlling the flow in the other direction? Is it a fixed resistance to the flow or will it be shut when the flow goes through via "ball path"?
Okay, let's say the cylinder is extending. The oil flows through the check valve, pushing the ball open. But on the rod end, the oil has to pass through a metered orifice, which slows it down. This means the amount of oil entering the blind end is exactly the same as what's coming out of the rod end-no more, no less. I hope this answered your question.
@@Thequestionis-u3l Thank you for the explanation. Let me chew on it for a while? I understand what you are saying - but not why it is needed :( What is wrong with letting the oil pass unhindred back to the reservoir is more or less what I'm wondering about ..
Nice explanation please share more videos
Thank you! I will.
Great teacher thank you.
Please make more videos on this topic.
Circuit diagram, troubleshooting etc ❤❤ love from india
Thank you, I will
Very simplified lesson but has a few issues. The counterbalance valve shown is not one usually used by industry. The pressure bleed down line from an accumulator to the reservoir should have a restriction in the outlet to avoid excessive flow rates. You mentioned that oil coolers have cooling tubes...yes but not always. The plate type heat exchanger has parallel plates. I think that there is one shown in the pictures. Full flow high pressure filters are a must for certain applications such as closed loop hydraulics where generated metal particles can circulate around in the loop and destroy everything...speaking from experience. Also I use high pressure filters in open loop circuits where the application has expensive components in it. The cost of the filter is minimal compared with the consequences. Also high pressure filters and normal return line filters have bypass valves to protect the filter if it becomes blocked. Also pressure switches are used to indicate a blocked filter. I realise this is an introduction but reservoir baffles to remove air? don't splash return oil to reservoirs? and moisture remove via desiccant filter breathers, shape of reservoirs? The other point to mention is that all circuits should be drawn in the deactivated state. Also circuits must consider vandalism especially on mobile equipmant. Some people think it great fun to put a handful of sand into the hydraulic reservoir. Cheers
Thank you for your input!
Thanks for video
Thanks!
Thank you so much for this. I just started a class on fluid power that has a lab. I like your analogy of reading a Hydraulic Schematic being like reading a treasure map, because that is exactly how I felt when I had my first lab. This video is helping me though, thank you so much!
You're very welcome!
I am glad to help.
Brilliant video. Excellent job explaining everything so clearly. 👍👍👍👍
Many thanks!
Super very useful for me sir please continue
Thanks!
Please explain difference between positive pressure and negative pressure hydraulic system in hydraulic excavator
Thank you for the comment. I will put it on my list of videos to make.
I need open loop and close loop pump video sir
Ok , will put it on my list, stay tuned. Thanks !
we need another video like this for pneumatics
It will be coming soon.
Nice video please share more
Thank you, I will
great effort , keep up
Thank you!
Do you have a second TH-cam acc. that is more detailed?
No, but how can I help?
Will 2nd relief valves always be before the check valve?
Yes.
Thank you for watching the video.
Do like to share this interesting video regarding hydraulic system, please.
Thank you for wanting to share my video! I’d really appreciate it if you could share the TH-cam link to ensure the original content stays connected to my channel. This helps me grow and continue creating more content. Let me know if you need any help with the link!
رائع❤
Thanks you! What else do you want to see?
what about a filter before the pump, no need for pressurised filter
That is called a strainer or suction filter and has a 120-micron rating, meaning it only filters out larger particles. It's typically a standard component of the unit, which is why I didn't specifically mention it. Thanks for watching and your comment.
👍
Thanks!
Pascal's law.
Pressure on an enclosed fluid remains undiminished and acts equally throughout the fluid in all directions
Thank you!
In the static scenario, yes. Otherwise NO.
👍
Thanks!